Students ________ wear uniforms at school., must, have to, You ________ clean the floor. I've already done it., don't have to, mustn't, You _______ drop litter here. It's against the rules!, don't have to, mustn't, Sue missed her train yesterday and she __________ wait two hours for the next one., have to, had to, It's a great book! You ________ read it!, have to, must, Tom is lucky. He ________ get up early on Monday mornings because he starts school at 10 a.m, doesn't have to, mustn't, When we were at school we ________ wear a uniform., must, have to, had to, You __________ be an expert to use the basic functions of program., mustn't, don't have to, The museum is free. You _________ pay., don't have to, mustn't, You ________ park here. It's an emergency exit., don't have to, mustn't

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